Machine for cutting packing-rings



(No Model.)

M. E. BRIGGS. MACHINE FOR CUTTING PACKING RINGS.

Patented Aug. 15, 1893.

if PMHM UNITED STATES PATENT OFFICE.

MORRIS E. BRIGGS, OF ST. LOUIS, MISSOURI.

MACHINE FOR CUTTING PACKING-RINGS.

SPECIFICATION forming part of Letters Patent No. 503,341, dated August15, 1893.

Application filed May 2, 1893- Serial No. 472.739. (No model.)

To all whom it may concern.-

Be it known that I, MoRRIs E. BRIGGS, a citizen of the United States,residing at St. Louis, in the State of Missouri, have invented a certainnew and useful Improvement in Machines for Cutting Packing-Rings, ofwhich the following is a full, clear, and exact description, referencebeing bad to the accompanying drawings, forming a part of thisspecification, wherein like symbols of reference refer to like partswherever they occur, and in which- Figure 1 is a side elevation, partlyin section. Fig. 2 is a top plan view with the knife removed. Fig. 3 isa front elevation. Fig. 4 is a form of ring, out on the machine.

My invention relates to a new and useful improvement in machines forcutting packing rings, for piston-rods, 850., in which a movable carrieris used for clamping and drawing the continuous packing (as it ishandled commercially), a given distance from the knife, (whichdetermines the diameter of the piston by a scale;) and in combiningtherewith, means for determining the varying compressions and consequentdifferences of the interior circumferences of rings of differentthicknesses. This I accomplish by the construction illustrated in theaccompanying drawings, in which- 1 indicates the base of any suitableform and construction, said base forming a support for a stationary drum2, which is bolted or-otherwise secured thereto. This drum 2 is formedwith a guide flange 2 which is preferably provided with a gage (notshown), for determining the thickness of the packing to be cut, thusobviating the necessity of first measuring the same. The upper portionof this drum is slotted as at 2 to afford reception of the blade of aknife 3 which is pivoted in the outer end of a hanger 4 secured to thedrum at an angle of about forty-five degrees. By so arranging the knife,when the packing to be out is in posit-ion against the guide flange 2the knife 3 when forced down, will, by its peculiar shaped cutting edge,sever the same, at the same time crowd ing the packing against the guideflange, thereby preventing any variance due to the possible displacementof the packing from its position against the flange.

On the front end of the drum, is a face plate 5, which is preferablysecured thereto, by through clamping bolts 6 and 7, the former beingcentrally located to center the respective parts, and the latter beinglocated to one side to add rigidity to the structure. These boltspreferably extend through the support 1, where they are clamped by theirrespective nuts. If desirable additional screws 5 may be added, whichare received into the drum 2 after passing through the face plate 5.This plate 5 is formed with a shoulder 5 on its inner side upon which isrevolubly received a movable carrier 8, in the form of a ring as shown,being provided with handles 9 for rotating the same. Secured to thisring and extending over the drum 2, is a clamp in which one end of thecontinuous packing is secured; this clamp comprising a securing member10 which is secured to the carrier 8, a right angle extension 11 whichextends over the drum 2, which extension is provided on its end with astop block 12, the operating face of which is cut on a plane parallelwith the cut of the knife 3, and a plate 13 provided with teeth on itsinner clamping edge, said plate being hinged to the securing member 10,and being operated by a thumb nut 14 mounted on a screw 15 which ispivotally mounted on the right angle extension 11 to accommodate thevarying angles assumed by the plate 13 in its movement. I preferablysurround the screw 15 by a spring 16 which tends at all times to holdthe plate away from the drum.

On the carrier ring 8, is a gage plate 17, which indicates the length itis required to cut a piece of packing, in order to insure a snug fitaround a shaft of given diameter. This length is of course determined bythe distance from the knife 3 to the stop block 12, it requiring, sayfor a piston of two inches diameter, a distance of 6.2832 inches betweenthe two. This distance of 6.2832 inches of lineal measurement betweenthe knife and the stop block, would of course be taken on the curvedline of the drum, and, as is well known, that the same lengths ofpacking of different thicknesses will not encircle the same shaft, it isnecessary to compensate for this variance in the thickness. Thisvariance is attributable to the reasons which I will illustrate asfollows: Assuming, for the purpose of illustration you have a shaft twoinches in diameter which you desire to encircle with packing rings, onering to be one-eighth of an inch thick, and the other to be one inch.The ring of one-eighth inch thickness would be out nearly six and fivesixteenths of an inch long, in order to allow for the compression of theinner circumference, while the ring of one inch thickness would have tobe cut about eight and one-half inches in length to compensate forgreater compression of its inner circumference which is due to thegreater bulk of material. To compensate for this, I mount on the drum "2a scale plate 18 which indicates the additional length necessary for thevarious thicknesses, over and above that required for atlat inelasticring, which would be 3.1416 times then placed against the stop block '12and the movable jaw or plate 13 forced down there= upon by its bindingscrew. The indicator 19 is then moved on the plate 18 until its side(say for convenience the right side face) is over the line marked gwhich I will indicats with the dotted line a. The carrier is then movedaway from the knife until the line on'the dial'l7 marked 2 registerswiththe point of the indicator 19, at which time the knife isdepressed,'severing-the packing to form a ringasshown' in Fig. 4. Shouldit be desired to cut a pieceof packing, say of one inch thickness, theend is first'cut at an angle and clamped in the clamping device orcarrier, as before. The indicator 19 will be moved to the left (orright, dependingupon the movement of the direction of the carrier awayfrom the knife) until the right side face is over the line marked oneinch on thescale plate 18. The carrier is then moved to the left untilthe line marked 2 registers with point'of the indicator 19, at whichtime the knife will be operated to sever thepacking. The line forindicatingthe one inch thickness of packing, I will represent by the:

dotted-line b and it will be the length of the distance between theselines a, and 6 relative to the position of the clamping device, which isrequired-for a one inch packing in excessof a one eighth inch packing,to compensate for the difference in thickness and conse* quentdifference in resiliency, due to the variance in the bulk of material,in order to cut the different thicknesses of packing to fit a shaft of agiven diameter. It will of course be understood, that the scale 17 ismeasured and marked to include shafts of different diameters,-and thescale 18 is measured and marked to indicate the position of the pointer19 for various thicknesses of packing other than those mentioned.

I am aware that many minor changes in the construction and arrangementof the several parts of my device can be made and substituted for thoseherein shown and described, without in the least departing from thenature and principle of my invention; such, for instance, instead ofarranging the parts in the form of a circle as shown, I can form astraight track for the carrier, which would perform the same function,the scales being present.

Having thus described my invention, what I claim, and desire to secureby Letters Patent, is-

1. In a machine for cuttingpacking rings, the combination with asuitable knife, and a support therefor of a carrier upon which thepacking material is received,-which carrier is provided with a clampingdevice for securing the end of the packing, a scale forindicating thediameter of the shaft,*arranged so that the movement of the car-riercanbe regulated thereby, and a scale for indicating the increasedlengthrequiredto compensate for the varying circumferences of thepacking-when shaped in the-form of a ring, due to their varyingresiliences and differencesin bulk, substantially as and for thepurposes described;

2. In a machine for cutting packing-rings, the combinationwith' asuitableknifepivotally mounted, of a movable carrier provided with aclamping device in which the end of the packing is secured, a scale fordetermining thedistance between the knife and the clamping device whichscale is markedwith the diameters of different sized pistons, a mov ableindicator for said scale, and a scale for said indicator,'fordetermining the'increaed length necessary for packingsof diiferent'thicknesses, substantially as and for the purposes described:

3. In a machine for cutting packing, the combination with a drum formedwith a knife slot, of a knife mounted on said'drum at an angle, acircular carrier provided with handles, and a clamping device mountedupon said carrier,substantially as and for the purposes described.

4. In a machine for cutting: packing, the

combination with a circular drum formed" with a guide flange andprovidedwitha knife slot, of a knife mounted thereon at an angle,

a carrier plate concentrically mounted'with relation to said drum, aclamping device mounted on the carrier, and a scale on theconibinationwith a circular drum provided with a knife slot, of a knifemounted thereon at an angle, a carrier ring concentrically arrangedrelative to the drum, a clamping device mounted on the carrier, a scalefor said carrier for determining the length of movement necessary forthe clamping device from the knife, for shafts or pistons of differentdiameters, a scale mounted on the drum forindicatin g the position of amovable pointer to determine the lengths required for differentthicknesses of packing, substantially as and for the purposes described.

6. In a machine for cutting packing the combination with a drum providedwith a knife slot of a knife mounted thereon at an angle, a carriermounted on the drum, a clamping device on the carrier, and a stop blockon the clamping device having its abutting face arranged at an anglecorrespnding to the blade of the knife, substantially as and for thepurposes described.

7. In a machine for cutting packing the combination with a drum providedwith a knife slot, a knife mounted thereon, a face plate formed with ashoulder clamped to the front end of the drum, through bolts for clamping said plate, a carrier ring revolubly mounted on the shoulder of theface plate, and a clamping device mounted on said ring and extendingover the drum, substantially as and for the purposes described.

8. In a machine for cutting packing, the combination with a suitableknife and carrier, of a clamping device comprising a rigid jaw, a stopblock formed with an inclined operating face mounted on therigid jaw, apivoted clamping jaw, a threaded bolt passing therethrough, said boltbeing pivoted on the rigid jaw, a spring surrounding the bolt forforcing the jaws apart, and a thumb nut on the bolt for forcing the jawstogethergsubstantially as and for the purposes described.

In testimony whereof I hereunto EtfilX my signature, in presence of twowitnesses, this 22d day of April, 1893.

MORRIS E. BRIGGS.

Witnesses:

F. R. CORNWALL, HUGH K. WAGNER.

